Air supply/exhaust system with vertical shaft

Air supply,exhaust/Exhaust system with vertical shaft

Applicable for any length of tunnel

This system exhausts polluted air inside a tunnel through a shaft and/or a duct and supplies external fresh air into the tunnel by using fans installed in a ventilation section or a ventilation tower.

The shaft type ventilation system is a system applicable for any length of tunnel by replacing polluted air with external fresh air through a shaft which is constructed at the place where hazardous substances in air inside the tunnel reach the permissible limit.

The exhaust system emits polluted air in a tunnel from a ventilation tower through a shaft, resulting in substantial reduction of hazardous substances at the wayout of tunnel.

The fan in this system can change the ventilation flow rate by variable pitch control mechanism.